"The SY85 comes with 512 kilobytes of internal wave RAM memory for storage of sound samples. Extra memory modules can be added to the SY85 to expand the wave memory to a maximum of 3.5 megabytes. Two types of expansion memory are available:
Yamaha SYEMB06 Memory Expansion Modules
One or two Yamaha SYEMB06 Memory Expansion Modules can be plugged into expansion slots provided on the SY85 bottom panel. Each SYEMB06 provides 512 kilobytes. With two SYEMB06 modules installed, you have a total of 1.5 megabytes of wave memory. Unlike the internal wave memory, SYEMB06 memory is “non-volatile”, so its contents are retained even when the SY85 power is turned off.
SIMM Memory Modules
The SY85 will also accommodate up to 2 megabytes of memory in SIMM memory modules. SIMM memory is volatile, so its contents will be lost whenever the SY85 power is turned off."